EP0169686A2 - Système anti-blocage hydraulique pour véhicules - Google Patents

Système anti-blocage hydraulique pour véhicules Download PDF

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Publication number
EP0169686A2
EP0169686A2 EP85304929A EP85304929A EP0169686A2 EP 0169686 A2 EP0169686 A2 EP 0169686A2 EP 85304929 A EP85304929 A EP 85304929A EP 85304929 A EP85304929 A EP 85304929A EP 0169686 A2 EP0169686 A2 EP 0169686A2
Authority
EP
European Patent Office
Prior art keywords
brake
wheel
front wheel
pressure
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85304929A
Other languages
German (de)
English (en)
Other versions
EP0169686A3 (en
EP0169686B1 (fr
Inventor
Glyn Phillip Reginald Farr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0169686A2 publication Critical patent/EP0169686A2/fr
Publication of EP0169686A3 publication Critical patent/EP0169686A3/en
Application granted granted Critical
Publication of EP0169686B1 publication Critical patent/EP0169686B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/343—Systems characterised by their lay-out
    • B60T8/344—Hydraulic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/72—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration responsive to a difference between a speed condition, e.g. deceleration, and a fixed reference

Definitions

  • This invention relates to hydraulic anti-skid braking systems for a vehicle of the four wheel type in which the behaviour of a braked wheel is sensed by skid sensing means and at a skid point is operative to actuate an anti-skid modulator for modulating the supply of brake-applying fluid to the brake of that wheel to prevent that wheel from locking.
  • the aim of hydraulic anti-skid systems of the kind set forth under a skid condition is to ensure that the vehicle can be steered and also that it has lateral or sideways stability.
  • a modulator is fitted to each front wheel brake, and each modulator also modulates the supply of fluid to the brake on the diagonally opposite rear wheel. If one modulator should fail, for example because of failure of its drive mechanism, one pair of diagonally opposed wheels can be braked fully to a skid point. On normal surfaces this provides a reasonably controlled stop because one of the front wheels is rotating, which allows the vehicle to be steered, and one of the rear wheels is also rotating to provide lateral or sideways stability.
  • the front wheel, of which the brake is controlled by the modulator will be running on a surface of a different ⁇ from that over which the diagonally opposite wheel is running. If the front wheel provided with the modulator is on the good surface and its diagonally opposite rear is on a slippery surface, then three of the four wheels can lock, and the vehicle is liable to spin.
  • Each anti-skid braking system comprises a single anti-skid modulator for modulating the supply of brake-applying fluid to the brakes on the rear wheels of a vehicle in responce to a skid signal, and means for equalising the pressures applied to the brakes on the rear wheels under such conditions.
  • an hydraulic anti-skid system of the kind set forth for a vehicle of the four-wheel type incorporates only one skid sensing means and only one anti-skid modulator, and the skid sensing means and the modulator are both associated with one front wheel, the modulator also controlling the operation of brakes on both rear wheels of the vehicle.
  • the rear wheel brakes are interconnected by a rear control valve which senses the pressure in the line downstream from the anti-skid modulator and is operative to isolate the brake on the front wheel not provided with the modulator from the brake on the diagonally opposite uncontrolled rear wheel and reduce the pressure applied to the brake in that uncontrolled rear wheel to that of the controlled rear.
  • the single anti-skid modulator modulates the pressure in its associated front wheel half directly and half indirectly by means of the rear control valve, and the brakes on both rear wheels. This leaves the two halves of the other front wheel brake applied normally without anti-skid, as before.
  • each front wheel 3, 4 is interconnected to a brake 5, 6 on each diagonally opposite rear wheel 7, 8.
  • Each front wheel 3, 4 is provided with a skid sensing and brake-pressure modulating unit 9, 10 which modulates the supply of pressure from a source of brake-applying fluid, suitably on hydraulic master cylinder (not shown), to the brake on a respective front wheel and on its diagonally opposite respective rear wheel in accordance with the behaviour of the said front wheel.
  • the unit 10 is operable to reduce the pressure applied to the brakes 2 and 6.
  • the wheels 4 and 8 will continue to rotate, as will the front wheel 3 which is braked on the portion of higher ⁇ and in any case can be controlled by the unit 9, but the rear wheel 7 will skid. This means that both front wheels 3 and 4 can steer, and the controlled rear wheel brake 6 is applied to give lateral or sideways stability to the vehicle.
  • Figures 3 and 4 show the effect of omitting the sensing and modulating unit 9 from the layout of Figures 1 and 2.
  • FIG. 1 An hydraulic anti-skid braking system in accordance with this invention and in the form of an X-split, is illustrated schematically in the layout of Figures 5 and 6, and in more detail in Figure 7.
  • a brake 11, 12 on each front wheel 13, 14 is interconnected with a brake 15, 16 on each diagonally opposite rear wheel 17, 18 through brake lines 19, 20.
  • the front wheel 14 is provided with a skid sensing and brake-pressure modulating unit 21, which comprises the sole modulating unit incorporated in the system.
  • the unit 21 may be of any convenient construction.
  • the brake lines 19 and 20 are interconnected on the downstream side of the unit 21 through a rear wheel control valve 22, and an apportioning valve 23 is located in the line 20 between the modulating unit 21 and the brake 16 in the diagonally opposite rear wheel 18.
  • the rear wheel control valve 22, see Figure 7, comprises a housing 24 having a longitudinally extending bore 25 which is closed at both ends and in which works a pair of oppositely acting expander and safety pistons 26 and 27 respectively which are urged away from each other and towards the closed ends of the bore 25 by means of a compression spring 28.
  • the piston 26 is of substantially constant'diameter throughout its axial length, but the piston 27 includes a portion 29 of increased diameter which works in an intermediate portion 30 of the bore, also of similarly increased diameter.
  • a one-way valve 31 is operated by the piston 26 to control communication between the brakes 11 and 15 through the line 19, with the fluid in the line 19 acting on the end of the piston 27 which is remote from the spring 28.
  • the brakes 11 and 15, and the brakes 12 and 16 are supplied with fluid under pressure from different pressure spaces of a tandem master cylinder 32, through lines 19a and 20a respectively, with the line 20a leading to the modulating unit 21.
  • a branch line 33 from the line 20a is connected into the housing 24 so that fluid from that pressure space acts on a shoulder 34 at the step in diameter of the piston 27 to urge the piston 27 into engagement with the adjacent closed end of the bore 25.
  • a space 35 in the bore 25 between the pistons 26 and 27 is connected into the line 20 on the downstream side of the apportioning valve 23 so that, normally, the valve 31 is held in an open position to provide unrestricted communication between the brakes 11 and 15 through the brake-line 19.
  • the modulator unit 21 is operative to isolate the line 20a from the front brake 12 and the line 20, and reduce the pressure applied to the front brake 12 and the pressure in line 20 applied to the rear brake 16. Since the pressure in the space 35 is also reduced, due to the pressure acting on the outer end of the piston 26, the piston 26 is displaced away from the adjacent closed end of the bore 25. Initial movement of the piston 26 in this direction permits the valve 31 to close, which isolates the rear brake 15 from the front brake 11, and subsequent movement of the piston 26 in this direction reduces the pressure applied to the brake 15 by expanding the effective volume of the portion of the line 19, between the valve 22 and the brake 15. When the wheel 14 recovers, the unit 21 re-applies pressure to the brakes 12 and 16, and the pressure applied to the brake 15 is also increased by the increased pressure in the space 35 displacing the piston 26 towards the adjacent closed end of the bore 25.
  • the hydraulic anti-skid braking system illustrated in Figure 8 of the drawings is of "HI"-split type.
  • Half lla, 12a of the brakes on the front wheels 13 and 14 are connected in first circuit with the master cylinder 32 and with the brakes 15, 16 on the rear wheels 17 and 18, and the remaining halves 11b and 12b of the brakes on the front wheels 13 and 14 are connected in a second circuit with the master cylinder 32.
  • the rear wheel control valve 22 is connected into both circuits.
  • the branch line 33 connects the master cylinder 32 and the brake halves lla and 12a into the housing 24 so that the pressure acts on the shoulder 34, and a line 50 to the brakes 15 and 16 on both rear wheels 17 and 18 is connected into the space 35 with an apportioning valve 51 being disposed between the brakes 15 and 16 and the connection between the line 50 and the space 35.
  • the brake halves llb and 12b are interconnected through the one-way valve 31 with the pressure in that circuit acting on the outer end of the piston 27 in opposition to the force of the pressure acting over the shoulder 34.
  • the modulator unit 21 is operative to reduce the pressure applied to the brake halves lla and 12a, and the pressure applied to both brakes 15 and 16 on the rear wheels 17 and 18 through the apportioning valve 51. Since the pressure in the space 35 is also reduced, the pressure from the master cylinder 32 acting on the outer end of the piston 26 urges that piston inwardly, initially to permit the one-way valve 31 to close thereby isolating the brake half 12b from the brake half llb, and subsequently reducing the pressure applied to the brake half 12b by expanding the effective volume of the connection between the valve 22 and the brake half 12b.
  • the wheels 13 and 18 When the wheels 13 and 18 are travelling over portions of lower ⁇ , the wheels 13 and 18 will skid but since the pressure applied to the brake 15 on the rear wheel 17 is controlled by the modulating unit 21, the wheel 17 will continue to rotate. Since the wheel 14 can be steered, the vehicle can be steered and has lateral or sideways stability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)
  • Hydraulic Control Valves For Brake Systems (AREA)
EP85304929A 1984-07-25 1985-07-10 Système anti-blocage hydraulique pour véhicules Expired EP0169686B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848418950A GB8418950D0 (en) 1984-07-25 1984-07-25 Hydraulic anti-skid systems
GB8418950 1984-07-25

Publications (3)

Publication Number Publication Date
EP0169686A2 true EP0169686A2 (fr) 1986-01-29
EP0169686A3 EP0169686A3 (en) 1986-12-30
EP0169686B1 EP0169686B1 (fr) 1989-05-17

Family

ID=10564429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85304929A Expired EP0169686B1 (fr) 1984-07-25 1985-07-10 Système anti-blocage hydraulique pour véhicules

Country Status (5)

Country Link
EP (1) EP0169686B1 (fr)
JP (1) JPS6137570A (fr)
KR (1) KR920006342B1 (fr)
DE (1) DE3570217D1 (fr)
GB (2) GB8418950D0 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0352595Y2 (fr) * 1986-05-19 1991-11-14
JPH089321B2 (ja) * 1986-09-19 1996-01-31 日本エ−ビ−エス株式会社 アンチスキッド装置用液圧制御装置
GB8723269D0 (en) * 1987-10-03 1987-11-04 Lucas Ind Plc Hydraulic anti-lock braking systems
JP3366915B2 (ja) * 1992-08-27 2003-01-14 日本電子工業株式会社 車両のアンチロックブレーキ装置の制御システム

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229049A (en) * 1977-10-04 1980-10-21 Aisin Seiki Kabushiki Kaisha Hydraulic pressure control system for split brake system
US4421362A (en) * 1980-11-10 1983-12-20 Toyota Jidosha Kogyo Kabushiki Kaisha Anti-skid brake control system for wheeled vehicles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1193269A (en) * 1966-08-31 1970-05-28 Rootes Motors Ltd Improvements in or relating to Braking Systems for Motor Vehicles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229049A (en) * 1977-10-04 1980-10-21 Aisin Seiki Kabushiki Kaisha Hydraulic pressure control system for split brake system
US4421362A (en) * 1980-11-10 1983-12-20 Toyota Jidosha Kogyo Kabushiki Kaisha Anti-skid brake control system for wheeled vehicles

Also Published As

Publication number Publication date
GB2162267B (en) 1987-11-25
KR920006342B1 (ko) 1992-08-03
EP0169686A3 (en) 1986-12-30
GB8517320D0 (en) 1985-08-14
GB2162267A (en) 1986-01-29
GB8418950D0 (en) 1984-08-30
DE3570217D1 (en) 1989-06-22
KR860000976A (ko) 1986-02-22
JPS6137570A (ja) 1986-02-22
EP0169686B1 (fr) 1989-05-17

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